US9945013B2 - Hot stamped steel and method for producing hot stamped steel - Google Patents

Hot stamped steel and method for producing hot stamped steel Download PDF

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Publication number
US9945013B2
US9945013B2 US14/371,512 US201314371512A US9945013B2 US 9945013 B2 US9945013 B2 US 9945013B2 US 201314371512 A US201314371512 A US 201314371512A US 9945013 B2 US9945013 B2 US 9945013B2
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Prior art keywords
steel
hot
rolling
hot stamping
martensite
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US20150010775A1 (en
Inventor
Toshiki Nonaka
Satoshi Kato
Kaoru Kawasaki
Toshimasa Tomokiyo
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Nippon Steel Corp
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Nippon Steel and Sumitomo Metal Corp
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Assigned to NIPPON STEEL & SUMITOMO METAL CORPORATION reassignment NIPPON STEEL & SUMITOMO METAL CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KATO, SATOSHI, KAWASAKI, KAORU, NONAKA, TOSHIKI, TOMOKIYO, TOSHIMASA
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
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    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
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    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0236—Cold rolling
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    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
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    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
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    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
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    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C21D8/0273—Final recrystallisation annealing
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    • Y10T428/1275—Next to Group VIII or IB metal-base component
    • Y10T428/12757—Fe
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12771—Transition metal-base component
    • Y10T428/12785—Group IIB metal-base component
    • Y10T428/12792—Zn-base component
    • Y10T428/12799—Next to Fe-base component [e.g., galvanized]

Definitions

  • the present invention relates to a hot stamped steel for which a cold rolled steel sheet for hot stamping having an excellent formability after hot stamping is used, and a method for producing the same.
  • hot stamping also called hot pressing, hot stamping, diequenching, press quenching or the like
  • the hot stamping refers to a forming method in which a steel sheet is heated at a high temperature of, for example, 700° C. or more, then hot-formed so as to improve the formability of the steel sheet, and quenched by cooling after forming, thereby obtaining desired material qualities.
  • a steel sheet used for a body structure of a vehicle is required to have a high press workability and a high strength.
  • a steel sheet having a ferrite and martensite structure, a steel sheet having a ferrite and bainite structure, a steel sheet containing retained austenite in a structure or the like is known as a steel sheet having both press workability and high strength.
  • a multi-phase steel sheet having martensite dispersed in a ferrite base has a low yield ratio and a high tensile strength, and furthermore, has excellent elongation characteristics.
  • the multi-phase steel sheet has a poor hole expansibility since stress concentrates at the interface between the ferrite and the martensite, and cracking is likely to initiate from the interface.
  • patent Documents 1 to 3 disclose the multi-phase steel sheet.
  • Patent Documents 4 to 6 describe relationships between the hardness and formability of a steel sheet.
  • Patent Document 1 Japanese Unexamined Patent Application, First Publication No. H6-128688
  • Patent Document 2 Japanese Unexamined Patent Application, First Publication No. 2000-319756
  • Patent Document 3 Japanese Unexamined Patent Application, First Publication No. 2005-120436
  • Patent Document 4 Japanese Unexamined Patent Application, First Publication No. 2005-256141
  • Patent Document 5 Japanese Unexamined Patent Application, First Publication No. 2001-355044
  • Patent Document 6 Japanese Unexamined Patent Application, First Publication No. H11-189842
  • An object of the present invention is to provide a hot stamped steel, for which a cold rolled steel sheet capable of ensuring a strength and have a more favorable hole expansibility when produced into a hot stamped steel is used, and a method for producing the same hot stamped steel.
  • the present inventors carried out intensive studies regarding a cold rolled steel sheet for hot stamping that ensured a strength after hot stamping (after quenching in a hot stamping process) and had an excellent formability (hole expansibility).
  • a fraction of a ferrite and a fraction of a martensite in the steel sheet are set to predetermined fractions, and the hardness ratio (difference of a hardness) of the martensite between a surface part of a sheet thickness and a central part of the sheet thickness of the steel sheet and the hardness distribution of the martensite in the central part of the sheet thickness are set in specific ranges, it is possible to industrially produce a cold rolled steel sheet for hot stamping capable of ensuring, in the steel sheet, a formability, that is, a characteristic of TS ⁇ 50000 MPa ⁇ % that is a larger value than ever in terms of TS ⁇ ,
  • the inventors have found a variety of aspects of the present invention as described below. In addition, it was found that the effects are not impaired even when a hot dip galvanized layer, a galvannealed layer, an electrogalvanized layer and an aluminized layer are formed on the cold rolled steel sheet.
  • a hot stamped steel includes, by mass %, C: 0.030% to 0.150%, Si: 0.010% to 1.00%, Mn: 1.50% to 2.70%, P: 0.001% to 0.060%, S: 0.001% to 0.010%, N: 0.0005% to 0.0100%, Al: 0.010% to 0.050%, and optionally one or more of B: 0.0005% to 0.0020%, Mo: 0.01% to 0.50%, Cr: 0.01% to 0.50%, V: 0.001% to 0.100%, Ti: 0.001% to 0.100%, Nb: 0.001% to 0.050%, Ni: 0.01% to 1.00%, Cu: 0.01% to 1.00%, Ca: 0.0005% to 0.0050%, REM: 0.00050% to 0.0050%, and a balance including Fe and unavoidable impurities, in which, when [C] represents an amount of C by mass %, [Si] represents an amount of Si by mass %, [Si] represents an amount of Si by mass
  • the H1 is an average hardness of the martensite in a surface part of a sheet thickness after the hot stamping
  • the H2 is an average hardness of the martensite in a central part of the sheet thickness which is an area having a width of 200 ⁇ m in a thickness direction at a center of the sheet thickness after the hot stamping
  • the ⁇ HM is a variance of the average hardness of the martensite in the central part of the sheet thickness after the hot stamping.
  • an area fraction of MnS existing in the hot stamped steel and having an equivalent circle diameter of 0.1 ⁇ m to 10 ⁇ m may be 0.01% or less, and a following expression (D) may be satisfied, n 2 /n 1 ⁇ 1.5 (D), and
  • the n1 is an average number density per 10000 ⁇ m 2 of the MnS having the equivalent circle diameter of 0.1 ⁇ m to 10 ⁇ m in a 1 ⁇ 4 part of the sheet thickness after the hot stamping
  • the n2 is an average number density per 10000 ⁇ m 2 of the MnS having the equivalent circle diameter of 0.1 ⁇ m to 10 ⁇ m in the central part of the sheet thickness after the hot stamping.
  • a hot dip galvanizing may be formed on a surface thereof.
  • a galvannealing may be formed on a surface of the hot dip galvanizing.
  • an electrogalvanizing may be formed on a surface thereof.
  • an aluminizing may be formed on a surface thereof.
  • a method for producing a hot stamped steel including casting a molten steel having a chemical composition according to the above (1) and obtaining a steel, heating the steel, hot-rolling the steel with a hot-rolling mill including a plurality of stands, coiling the steel after the hot-rolling, pickling the steel after the coiling, cold-rolling the steel with a cold-rolling mill including a plurality of stands after the pickling under a condition satisfying a following expression (E), annealing in which the steel is annealed under 700° C. to 850° C.
  • E following expression
  • the method for producing the hot stamped steel according to any one of the above (7) to (9) may further include galvanizing the steel between the annealing and the temper-rolling.
  • the method for producing the hot stamped steel according to the above (10) may further include alloying the steel between the galvanizing and the temper-rolling.
  • the method for producing the hot stamped steel according to any one of the above (7) to (9) may further include electrogalvanizing the steel after the temper-rolling.
  • the method for producing the hot stamped steel according to any one of the above (7) to (9) may further include aluminizing the steel between the annealing and the temper-rolling.
  • the hardness of the martensite measured with a nanoindenter is set to an appropriate value, it is possible to obtain a more favorable hole expansibility in the hot stamped steel.
  • FIG. 1 is a graph illustrating the relationship between (5 ⁇ [Si]+[Mn])/[C] and TS ⁇ in a cold rolled steel sheet for hot stamping before hot stamping and a hot stamped steel.
  • FIG. 2A is a graph illustrating a foundation of an expression (B) and is a graph illustrating the relationship between an H20/H10 and ⁇ HM0 in the cold rolled steel sheet for hot stamping before hot stamping and the relationship between H2/H1 and ⁇ HM in the hot stamped steel.
  • FIG. 2B is a graph illustrating a foundation of an expression (C) and is a graph illustrating the relationship between ⁇ HM0 and TS ⁇ in the cold rolled steel sheet for hot stamping before hot stamping and the relationship between ⁇ HM and TS ⁇ in the hot stamped steel.
  • FIG. 3 is a graph illustrating the relationship between n20/n10 and TS ⁇ in the cold rolled steel sheet for hot stamping before hot stamping and the relationship between n2/n1 and TS ⁇ in the hot stamped steel and illustrating a foundation of an expression (D).
  • FIG. 4 is a graph illustrating the relationship between 1.5 ⁇ r1/r+1.2 ⁇ r2/r+r3/r and H20/H10 in the cold rolled steel sheet for hot stamping before hot stamping and the relationship between 1.5 ⁇ r1/r+1.2 ⁇ r2/2+r3/r and H2/H1 in the hot stamped steel, and illustrating a foundation of an expression (E).
  • FIG. 5A is a graph illustrating the relationship between an expression (F) and a fraction of a martensite.
  • FIG. 5B is a graph illustrating the relationship between the expression (F) and a fraction of a pearlite.
  • FIG. 6 is a graph illustrating the relationship between T ⁇ ln(t)/(1.7 ⁇ [Mn]+[S]) and TS ⁇ , and illustrating a foundation of an expression (G).
  • FIG. 7 is a perspective view of a hot stamped steel used in an example.
  • FIG. 8 is a flowchart illustrating a method for producing the hot stamped steel for which a cold rolled steel sheet for hot stamping is used according to an embodiment of the present invention.
  • % that is a unit of an amount of an individual component indicates “mass %”.
  • the amount of C is an important element to strengthen the martensite and increase the strength of the steel.
  • the amount of C is less than 0.030%, it is not possible to sufficiently increase the strength of the steel.
  • the amount of C exceeds 0.150%, degradation of the ductility (elongation) of the steel becomes significant. Therefore, the range of the amount of C is set to 0.030% to 0.150%. In a case in which there is a demand for high hole expansibility, the amount of C is desirably set to 0.100% or less.
  • Si is an important element for suppressing a formation of a harmful carbide and obtaining a multi-phase structure mainly including a ferrite structure and a balance of the martensite.
  • the amount of Si exceeds 1.0%, the elongation or hole expansibility of the steel degrades, and a chemical conversion treatment property also degrades. Therefore, the amount of Si is set to 1.000% or less.
  • the Si is added for deoxidation, a deoxidation effect is not sufficient when the amount of Si is less than 0.010%. Therefore, the amount of Si is set to 0.010% or more.
  • Al is an important element as a deoxidizing agent. To obtain the deoxidation effect, the amount of Al is set to 0.010% or more. On the other hand, even when the Al is excessively added, the above-described effect is saturated, and conversely, the steel becomes brittle. Therefore, the amount of Al is set in a range of 0.010% to 0.050%.
  • Mn is an important element for increasing a hardenability of the steel and strengthening the steel.
  • the amount of Mn is less than 1.50%, it is not possible to sufficiently increase the strength of the steel.
  • the amount of Mn exceeds 2.70%, since the hardenability increases more than necessary, an increase in the strength of the steel is caused, and consequently, the elongation or hole expansibility of the steel degrades. Therefore, the amount of Mn is set in a range of 1.50% to 2.70%. In a case in which there is a demand for high elongation, the amount of Mn is desirably set to 2.00% or less.
  • the amount of P is set to 0.060% or less.
  • the amount of P is desirably set to 0.001% or more.
  • the upper limit of the amount of S is set to 0.010%.
  • a lower limit of the amount of S is desirably set to 0.001%.
  • N is an important element to precipitate MN and the like and miniaturize crystal grains.
  • the amount of N exceeds 0.0100%, a N solid solution (nitrogen solid solution) remains and the ductility of the steel is degraded. Therefore, the amount of N is set to 0.0100% or less. Due to a problem of refining costs, the lower limit of the amount of N is desirably set to 0.0005%.
  • the hot stamped steel for which the cold rolled steel sheet for hot stamping is used according to the embodiment has a basic composition including the above-described components, Fe as a balance and unavoidable impurities, but may further contain any one or more elements of Nb, Ti, V, Mo, Cr, Ca, REM (rare earth metal), Cu, Ni and B as elements that have thus far been used in amounts that are equal to or less than the below-described upper limits to improve the strength, to control a shape of a sulfide or an oxide, and the like. Since these chemical elements are not necessarily added to the steel sheet, the lower limits thereof are 0%.
  • Nb, Ti and V are elements that precipitate a fine carbonitride and strengthen the steel.
  • Mo and Cr are elements that increase hardenability and strengthen the steel.
  • Nb: more than 0.050%, Ti: more than 0.100%, V: more than 0.100%, Mo: more than 0.50%, and Cr: more than 0.50% are contained, the strength-increasing effect is saturated, and there is a concern that the degradation of the elongation or the hole expansibility may be caused.
  • the steel may further contain Ca in a range of 0.0005% to 0.0050%.
  • Ca and rare earth metal (REM) control the shape of the sulfide or the oxide and improve the local ductility or the hole expansibility.
  • an upper limit of the amount of Ca is set to 0.0050%.
  • the rare earth metal (REM) as well, it is preferable to set the lower limit of the amount to 0.0005% and the upper limit of the amount to 0.0050%.
  • the steel may further contain Cu: 0.01% to 1.00%, Ni: 0.01% to 1.00% and B: 0.0005% to 0.0020%. These elements also can improve the hardenability and increase the strength of the steel. However, to obtain the effect, it is preferable to contain Cu: 0.01% or more, Ni: 0.01% or more and B: 0.0005% or more. In a case in which the amounts are equal to or less than the above-described values, the effect that strengthens the steel is small. On the other hand, even when Cu: more than 1.00%, Ni: more than 1.00% and B: more than 0.0020% are added, the strength-increasing effect is saturated, and there is a concern that the ductility may degrade.
  • the steel contains B, Mo, Cr, V, Ti, Nb, Ni, Cu, Ca and REM
  • one or more elements are contained.
  • the balance of the steel is composed of Fe and unavoidable impurities.
  • Elements other than the above-described elements for example, Sn, As and the like
  • B, Mo, Cr, V, Ti, Nb, Ni, Cu, Ca and REM are contained in amounts that are less than the above-described lower limits, the elements are treated as unavoidable impurities.
  • the above expression (A) is preferably satisfied.
  • the value of (5 ⁇ [Si]+[Mn])/[C] is 11 or less, it is not possible to obtain a sufficient hole expansibility. This is because, when the amount of C is large, the hardness of a hard phase becomes too high, a hardness difference (ratio of the hardness) between the hard phase and a soft phase becomes great, and therefore the ⁇ value deteriorates, and, when the amount of Si or the amount of Mn is small, TS becomes low.
  • the value of (5 ⁇ [Si]+[Mn])/[C] since the value does not change even after hot stamping as described above, the expression is preferably satisfied during a production of the metal sheet.
  • the hardness ratio between the surface part of the sheet thickness and the central part of the sheet thickness in the cold rolled steel sheet for hot stamping for the hot stamped steel according to the embodiment before hot stamping and the hardness ratio between the surface part of the sheet thickness and the central part of the sheet thickness in the hot stamped steel, for which the cold rolled steel sheet for hot stamping is used according to the embodiment, are almost the same.
  • the variance of the hardness of the martensite in the central part of the sheet thickness in the cold rolled steel sheet for hot stamping for the hot stamped steel according to the embodiment before hot stamping and the variance of the hardness of the martensite in the central part of the sheet thickness in the hot stamped steel, for which the cold rolled steel sheet for hot stamping is used according to the embodiment, are almost the same. Therefore, the formability of the cold rolled steel sheet for a hot stamping for the hot stamped steel according to the embodiment is similarly excellent to the formability of the hot stamped steel for which the cold rolled steel sheet for hot stamping is used according to the embodiment.
  • H1 is the average hardness of the martensite in the surface part of the sheet thickness that is within an area having a width of 200 ⁇ m in a thickness direction from an outermost layer of the steel sheet in the thickness direction in the hot stamped steel
  • H2 is the average hardness of the martensite in an area having a width of ⁇ 100 ⁇ m in the thickness direction from the central part of the sheet thickness in the central part of the sheet thickness in the hot stamped steel
  • ⁇ HM is the variance of the hardness of the martensite in an area having a width of ⁇ 100 ⁇ m in the thickness direction from the central part of the sheet thickness in the hot stamped steel.
  • H10 is the hardness of the martensite in the surface part of the sheet thickness in the cold rolled steel sheet for hot stamping before hot stamping
  • H20 is the hardness of the martensite in the central part of the sheet thickness, that is, in an area having a width of 200 ⁇ m in the thickness direction in a center of the sheet thickness in the cold rolled steel sheet for hot stamping before hot stamping
  • ⁇ HM0 is the variance of the hardness of the martensite in the central part of the sheet thickness in cold rolled steel sheet for hot stamping before hot stamping.
  • the H1, H10, H2, H20, ⁇ HM and ⁇ HM0 are obtained respectively from 300-point measurements for each.
  • An area having a width of ⁇ 100 ⁇ m in the thickness direction from the central part of the sheet thickness refers to an area having a center at the center of the sheet thickness and having a dimension of 200 ⁇ m in the thickness direction.
  • the variance is a value obtained using a following expression (K) and indicating a distribution of the hardness of the martensite.
  • x ave represents the average value of the hardness
  • x i represents an i th hardness
  • a value of H2/H1 of 1.10 or more represents that the hardness of the martensite in the central part of the sheet thickness is 1.10 or more times the hardness of the martensite in the surface part of the sheet thickness, and, in this case, ⁇ HM becomes 20 or more even after hot stamping as illustrated in FIG. 2A .
  • the value of the H2/H1 is 1.10 or more, the hardness of the central part of the sheet thickness becomes too high, TS ⁇ becomes less than 50000 MPa ⁇ % as illustrated in FIG. 2B , and a sufficient formability cannot be obtained both before quenching (that is, before hot stamping) and after quenching (that is, after hot stamping).
  • the lower limit of the H2/H1 becomes the same in the central part of the sheet thickness and in the surface part of the sheet thickness unless a special thermal treatment is carried out; however, in an actual production process, when considering productivity, the lower limit is, for example, up to approximately 1.005. What has been described above regarding the value of H2/H1 shall also apply in a similar manner to the value of H20/H10.
  • the variance ⁇ HM being 20 or more even after hot stamping indicates that a scattering of the hardness of the martensite is large, and parts in which the hardness is too high locally exist.
  • TS ⁇ becomes less than 50000 MPa ⁇ % as illustrated in FIG. 2B , and a sufficient formability of the hot stamped steel cannot be obtained.
  • What has been described above regarding the value of the ⁇ HM shall also apply in a similar manner to the value of the ⁇ HM0.
  • the area fraction of the ferrite in a metallographic structure after hot stamping is 40% to 90%.
  • the area fraction of the ferrite is less than 40%, a sufficient elongation or a sufficient hole expansibility cannot be obtained.
  • the area fraction of the ferrite exceeds 90%, the martensite becomes insufficient, and a sufficient strength cannot be obtained. Therefore, the area fraction of the ferrite in the hot stamped steel is set to 40% to 90%.
  • the metallographic structure of the hot stamped steel also includes the martensite, an area fraction of the martensite is 10% to 60%, and a total of the area fraction of the ferrite and the area fraction of the martensite is 60% or more.
  • All or principal parts of the metallographic structure of the hot stamped steel are occupied by the ferrite and the martensite, and furthermore, one or more of a pearlite, a bainite as remainder and a retained austenite may be included in the metallographic structure.
  • a pearlite, a bainite as remainder and a retained austenite may be included in the metallographic structure.
  • the retained austenite is substantially not included; however, unavoidably, 5% or less of the retained austenite in a volume ratio may be included.
  • the pearlite is a hard and brittle structure, it is preferable not to include the pearlite in the metallographic structure; however, unavoidably, up to 10% of the pearlite in an area fraction may be included.
  • the amount of the bainite as remainder is preferably 40% or less in an area fraction with respect to a region excluding the ferrite and the martensite.
  • the metallographic structures of the ferrite, the bainite as remainder and the pearlite were observed through Nital etching, and the metallographic structure of the martensite was observed through Le pera etching. In both cases, a 1 ⁇ 4 part of the sheet thickness was observed at a magnification of 1000 times.
  • the volume ratio of the retained austenite was measured with an X-ray diffraction apparatus after polishing the steel sheet up to the 1 ⁇ 4 part of the sheet thickness.
  • the 1 ⁇ 4 part of the sheet thickness refers to a part 1 ⁇ 4 of the thickness of the steel sheet away from a surface of the steel sheet in a thickness direction of the steel sheet in the steel sheet.
  • the hardness of the martensite measured at a magnification of 1000 times is specified by using a nanoindenter. Since an indentation formed in an ordinary Vickers hardness test is larger than the martensite, according to the Vickers hardness test, while a macroscopic hardness of the martensite and peripheral structures thereof (ferrite and the like) can be obtained, it is not possible to obtain the hardness of the martensite itself. Since the formability (hole expansibility) is significantly affected by the hardness of the martensite itself, it is difficult to sufficiently evaluate the formability only with a Vickers hardness. On the contrary, in the embodiment, since an appropriate relationship of the hardness of the martensite in the hot stamped steel measured with the nanoindenter is provided, it is possible to obtain an extremely favorable formability.
  • a reason for not counting the MnS having the equivalent circle diameter of less than 0.1 ⁇ m is that an effect on the stress concentration is small.
  • a reason for not counting the MnS having the equivalent circle diameter of more than 10 ⁇ m is that, the MnS having the above-described grain size is included in the steel sheet, the grain size is too large, and the steel sheet becomes unsuitable for working.
  • the area fraction of the MnS having the equivalent circle diameter of 0.1 ⁇ m to 10 ⁇ m exceeds 0.01%, since it becomes easy for fine cracks generated due to the stress concentration to propagate, the hole expansibility further deteriorates, and there is a case in which the condition of TS ⁇ 50000 MPa ⁇ % is not satisfied.
  • n1 and n10 are number densities of the MnS having the equivalent circle diameter of 0.1 ⁇ m to 10 ⁇ m at the 1 ⁇ 4 part of the sheet thickness in the hot stamped steel and the cold rolled steel sheet before hot stamping respectively
  • n2 and “n20” are number densities of the MnS having the equivalent circle diameter of 0.1 ⁇ m to 10 ⁇ m at the central part of the sheet thickness in the hot stamped steel and the cold rolled steel sheet before hot stamping respectively.
  • the formability is likely to degrade.
  • the lower limit of the area fraction of the MnS is not particularly specified, however, 0.0001% or more of the MnS is present due to a below-described measurement method, a limitation of a magnification and a visual field, and an original amount of Mn or the S.
  • a value of an n2/n1 (or an n20/n10) being 1.5 or more represents that a number density of the MnS having the equivalent circle diameter of 0.1 ⁇ m to 10 ⁇ m in the central part of the sheet thickness of the hot stamped steel (or the cold rolled steel sheet for hot stamping before hot stamping) is 1.5 or more times the number density of the MnS having the equivalent circle diameter of 0.1 ⁇ m to 10 ⁇ m in the 1 ⁇ 4 part of the sheet thickness of the hot stamped steel (or the cold rolled steel sheet for hot stamping before hot stamping).
  • the formability is likely to degrade due to a segregation of the MnS in the central part of the sheet thickness of the hot stamped steel (or the cold rolled steel sheet for hot stamping before hot stamping).
  • FIG. 3 is a view illustrating a relationship between the n2/n1 and TS ⁇ after hot stamping and a relationship between an n20/n10 and TS ⁇ before hot stamping, and, according to FIG.
  • the n20/n10 of the cold rolled steel sheet before hot stamping and the n2/n1 of the hot stamped steel are almost the same. This is because the form of the MnS does not change at a heating temperature of a hot stamping, generally.
  • a galvanizing, a galvannealing, an electrogalvanizing or an aluminizing on a surface of the hot stamped steel for which the cold rolled steel sheet for hot stamping is used according to the embodiment in terms of rust prevention.
  • a formation of the above-described platings does not impair the effects of the embodiment.
  • the above-described platings can be carried out with a well-known method.
  • the cold rolled steel sheet (a cold rolled steel sheet, a galvanized cold rolled steel sheet, a galvannealed cold rolled steel sheet, an electrogalvannealed cold rolled steel sheet and an aluminized cold rolled steel sheet) for hot stamping is used according to the embodiment will be described.
  • the hot stamped steel for which the cold rolled steel sheet for hot stamping is used according to the embodiment As an ordinary condition, a molten steel from a melting process in a converter is continuously cast, thereby producing a slab.
  • a molten steel from a melting process in a converter is continuously cast, thereby producing a slab.
  • the continuous casting when a casting rate is fast, a precipitate of Ti and the like becomes too fine, and, when the casting rate is slow, a productivity deteriorates, and consequently, a metallographic structure of the above-described precipitate coarsens and the number of particles in the metallographic structure decreases, and thus, there is a case other characteristics such as a delayed fracture cannot be controlled. Therefore, the casting rate is desirably 1.0 m/minute to 2.5 m/minute.
  • the slab after the casting can be subjected to hot-rolling as it is.
  • the slab after cooling has been cooled to less than 1100° C.
  • a slab temperature is less than 1100° C.
  • the hot stamped steel for which a steel sheet for hot stamping to which Ti and Nb are added is used, since a dissolution of the precipitate becomes insufficient during the heating, which causes a decrease in a strength.
  • the heating temperature is more than 1300° C.
  • a generation of a scale becomes great, and there is a case in which it is not possible to make favorable a surface property of the hot stamped steel for which the cold rolled steel sheet for hot stamping is used.
  • the temperature of the heating furnace before carrying out hot-rolling refers to an extraction temperature at an outlet side of the heating furnace
  • the in-furnace time refers to a time elapsed from an insertion of the slab into the hot heating furnace to an extraction of the slab from the heating furnace. Since the MnS does not change even after hot stamping as described above, it is preferable to satisfy the expression (G) in a heating process before hot-rolling.
  • the hot-rolling is carried out according to a conventional method.
  • the finishing temperature (the hot-rolling end temperature) which is set in a range of an Ar 3 temperature to 970° C.
  • the hot-rolling becomes a ( ⁇ + ⁇ ) two-phase region rolling (two-phase region rolling of the ferrite+the martensite), and there is a concern that the elongation may degrade.
  • the finishing temperature exceeds 970° C., an austenite grain size coarsens, and the fraction of the ferrite becomes small, and thus, there is a concern that the elongation may degrade.
  • a hot-rolling facility may have a plurality of stands.
  • the Ar 3 temperature was estimated from an inflection point of a length of a test specimen after carrying out a formastor test.
  • the steel After the hot-rolling, the steel is cooled at an average cooling rate of 20° C./second to 500° C./second, and is coiled at a predetermined coiling temperature CT.
  • the average cooling rate is less than 20° C./second, the pearlite that causes the degradation of the ductility is likely to be formed.
  • an upper limit of the cooling rate is not particularly specified and is set to approximately 500° C./second in consideration of a facility specification, but is not limited thereto.
  • the cold-rolling is desirably carried out with a tandem rolling mill in which a plurality of rolling mills are linearly disposed, and the steel sheet is continuously rolled in a single direction, thereby obtaining a predetermined thickness.
  • a tandem rolling mill in which a plurality of rolling mills are linearly disposed, and the steel sheet is continuously rolled in a single direction, thereby obtaining a predetermined thickness.
  • the total cold-rolling reduction is a so-called cumulative reduction, and on a basis of the sheet thickness at an inlet of a first stand, is a percentage of the cumulative reduction (a difference between the sheet thickness at the inlet before a first pass and the sheet thickness at an outlet after a final pass) with respect to the above-described basis.
  • the inventors found that, when the expression (E) is satisfied, an obtained form of the martensite structure after the annealing is maintained in almost the same state even after hot stamping is carried out, and therefore the hot stamped steel for which the cold rolled steel sheet for hot stamping is used according to the embodiment becomes advantageous in terms of the elongation or the hole expansibility even after hot stamping.
  • the hot stamped steel for which the cold rolled steel sheet for hot stamping is used according to the embodiment is heated up to the two-phase region in the hot stamping, a hard phase including the martensite before hot stamping turns into an austenite structure, and the ferrite before hot stamping remains as it is.
  • Carbon (C) in the austenite does not move to the peripheral ferrite.
  • the austenite turns into a hard phase including the martensite. That is, when the expression (E) is satisfied and the above-described H2/H1 (or H20/H10) is in a predetermined range, the H2/H1 is maintained even after hot stamping and hot stamped steel becomes excellent in terms of the formability.
  • r, r1, r2 and r3 are the target cold-rolling reductions.
  • the cold-rolling is carried out while controlling the target cold-rolling reduction and an actual cold-rolling reduction to become substantially the same value. It is not preferable to carry out the cold-rolling in a state in which the actual cold-rolling reduction is unnecessarily made to be different from the target cold-rolling reduction.
  • the embodiment is carried out when the actual cold-rolling reduction satisfies the expression (E).
  • the actual cold-rolling reduction is preferably within ⁇ 10% of the cold-rolling reduction.
  • a recrystallization is caused in the steel sheet by carrying out the annealing.
  • the annealing forms a desired martensite.
  • an annealing temperature it is preferable to carry out the annealing by heating the steel sheet to 700° C. to 850° C., and cool the steel sheet to a room temperature or a temperature at which a surface treatment such as the galvanizing is carried out.
  • annealing When the annealing is carried out in the above-described range, it is possible to stably ensure a predetermined area fraction of the ferrite and a predetermined area fraction of the martensite, to stably set a total of the area fraction of the ferrite and the area fraction of the martensite to 60% or more, and to contribute to an improvement of TS ⁇ .
  • Other annealing conditions are not particularly specified, but a holding time at 700° C. to 850° C.
  • temper-rolling is carried out with a conventional method.
  • An elongation ratio of the temper-rolling is, generally, approximately 0.2% to 5%, and is preferable within a range in which a yield point elongation is avoided and the shape of the steel sheet can be corrected.
  • the ferrite and the hard phase have an ideal distribution form before hot stamping as described above.
  • the distribution form is maintained as described above. If it is possible to more reliably ensure the above-described metallographic structure by satisfying the expression (F), the metallographic structure is maintained even after hot stamping, and the hot stamped steel becomes excellent in terms of the formability.
  • a galvanizing process in which a galvanizing is formed between an annealing process and the temper-rolling process, and to form the galvanizing on a surface of the cold rolled steel sheet.
  • an alloying process in which an alloying treatment is performed after galvanizing. In a case in which the alloying treatment is performed, a treatment in which a galvannealed surface is brought into contact with a substance oxidizing a sheet surface such as water vapor, thereby thickening an oxidized film may be further carried out on the surface.
  • an electrogalvanizing process in which an electrogalvanizing is formed after the temper-rolling process as well as the galvanizing and the galvannealing and to form an electrogalvanizing on the surface of the cold rolled steel sheet.
  • an aluminizing process in which an aluminizing is formed between the annealing process and the temper-rolling process, and to form the aluminizing on the surface of the cold rolled steel sheet.
  • the aluminizing is generally hot dip aluminizing, which is preferable.
  • the hot stamping is carried out by heating the steel sheet to 700° C. to 1000° C.
  • the hot stamping is desirably carried out, for example, under the following conditions.
  • the steel sheet is heated up to 700° C. to 1000° C. at the temperature-increase rate of 5° C./second to 500° C./second, and the hot stamping (a hot stamping process) is carried out after the holding time of 1 second to 120 seconds.
  • the heating temperature is preferably an Ac 3 temperature or less. The Ac 3 temperature was estimated from the inflection point of the length of the test specimen after carrying out the formastor test.
  • the steel sheet is cooled, for example, to the room temperature to 300° C. at the cooling rate of 10° C./second to 1000° C./second (quenching in the hot stamping).
  • the heating temperature in the hot stamping process is less than 700° C., the quenching is not sufficient, and consequently, the strength cannot be ensured, which is not preferable.
  • the heating temperature is more than 1000° C., the steel sheet becomes too soft, and, in a case in which a plating, particularly zinc plating, is formed on the surface of the steel sheet, and the sheet, there is a concern that the zinc may be evaporated and burned, which is not preferable. Therefore, the heating temperature in the hot stamping is preferably 700° C. to 1000° C.
  • the temperature-increase rate is less than 5° C./second, since it is difficult to control heating in the hot stamping, and the productivity significantly degrades, it is preferable to carry out the heating at the temperature-increase rate of 5° C./second or more.
  • an upper limit of the temperature-increase rate of 500° C./second is depends on a current heating capability, but is not necessary to limit thereto.
  • the cooling rate of less than 10° C./second since the rate control of the cooling after hot stamping process is difficult, and the productivity also significantly degrades, it is preferable to carry out the cooling at the cooling rate of 10° C./second or more.
  • An upper limit of the cooling rate of 1000° C./second depends on a current cooling capability, but is not necessary to limit thereto.
  • a reason for setting a time until the hot stamping after an increase in the temperature to 1 second or more is a current process control capability (a lower limit of a facility capability), and a reason for setting the time until the hot stamping after the increase in the temperature to 120 seconds or less is to avoid an evaporation of the zinc or the like in a case in which the galvanizing or the like is formed on the surface of the steel sheet.
  • a reason for setting the cooling temperature to the room temperature to 300° C. is to sufficiently ensure the martensite and ensure the strength of the hot stamped steel.
  • FIG. 8 is a flowchart illustrating the method for producing the hot stamped steel for which a cold rolled steel sheet for hot stamping according to an embodiment of the present invention is used.
  • Reference signs S 1 to S 13 in the drawing respectively correspond to individual process described above.
  • the expression (B) and the expression (C) are satisfied even after hot stamping is carried out under the above-described condition.
  • the cold-rolling was carried out so that the value of the expression (E) became a value described in Table 5.
  • annealing was carried out in a continuous annealing furnace at an annealing temperature described in Table 2.
  • a galvanizing was further formed in the middle of cooling after a soaking in the continuous annealing furnace, and then an alloying treatment was further performed on the part of the steel sheets, thereby forming a galvannealing.
  • an electrogalvanizing or an aluminizing was formed on the part of the steel sheets.
  • temper-rolling was carried out at an elongation ratio of 1% according to a conventional method.
  • d′ a hole diameter when a crack penetrates the sheet thickness
  • CR represents a non-plated cold rolled steel sheet
  • GI represents that the galvanizing is formed
  • GA represents that the galvannealing is formed
  • EG represents that the electrogalvanizing is formed
  • Al represents that the aluminizing is formed.
  • G a target condition expression is satisfied.
  • the hot stamped steel which are obtained in the present invention and for which the cold rolled steel sheet for hot stamping is used, can satisfy TS ⁇ 50000 MPa ⁇ % after hot stamping, the hot stamped steel has a high press workability and a high strength, and satisfies the current requirements for a vehicle such as an additional reduction of the weight and a more complicated shape of a component.

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